カチオン界面活性剤水溶液中におけるスチレン/2-ヒドロキシエチル=メタクリレート共重合体ラテックスの凝集性と表面吸着性

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The coagulation and surface adsorbability of styrene/2-hydroxyethyl methacrylate [P (St/HEMA0.5), P (St/HEMA1), P (St/HEMA2) and P (St/HEMA3), subscripts of 0.5, 1, 2and 3 represented the mol% of total monomer] copolymer lances and polystyrene (PS) latex in aqueous solution of alkyl pyridinium bromides (abbr.APB, CnH2n+1NC5H5Br;n=12 : DPB, n=14 : TPB and n=16 : KPB) were investigated by the stopped flow method and were measured for their ζ-potential. The distance t from the Stern layer to the slipping plane in the electrical double layer on the latex surface increased with the HEMA fraction. The surfactant adsorption decreased with increase in the HEMA fraction, in the order of PS, P (St/HEMA0.5), P (St/HEMA1), P (St/HEMA2) and P (St/HEMA3).The concentration of surfactant on which coagulation occured sifted to higher concentration of surfactant with decreasing surfactant adsorption on the latex, in the order of PS, P (St/HEMA0.5), P (St/HEMA1), P (St/HEMA2) and P (St/HEMA3). The minimum value of the stability ratio (log W) of the latex particles corresponded to the zero point of charge of the latex in the ζ-log C (C : surfactant concentration) curve.
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